# Boat Value Calculator

> A boat value calculator gives a starting point. Condition, survey findings and engine hours move the number far more than the model year.

## Key facts

- Guide values price a model, so on any boat more than a few seasons old the survey moves the number more than the model year does.
- Engine hours are the largest single adjustment on most powerboats, because a repower can be a substantial share of hull value.
- Buyers deduct the cost to rectify survey findings, so a seller who has already fixed them negotiates from a stronger position than one offering a discount.
- Asking prices and achieved prices diverge widely on boats, which is why comparables should be sales rather than listings.
- Title, lien and documentation defects stop sales rather than adjust prices, and are checkable before a price is agreed.

## Key pages

- [Boat value calculator: what is your boat actually worth?](https://boatvaluecalculator.com/): the main tool, answer above the fold.
- [Guide value, comparable sales and what a surveyor adds](https://boatvaluecalculator.com/how-boats-are-valued/): Guide values are a starting point. What comparable sales and a survey add, and why asking prices mislead on boats.
- [Engine hours: the adjustment that dominates most powerboats](https://boatvaluecalculator.com/engine-hours-and-value/): Hours matter less on their own than hours against expected use and service history. How buyers actually read them.
- [What to check before a price is agreed](https://boatvaluecalculator.com/before-you-agree-a-price/): Title, liens, documentation and dockage. The checks that stop a sale rather than adjust it, and when to do them.
- [What actually moves a used boat's value, 2026](https://boatvaluecalculator.com/#data): original data table, updated 2026-08-15.
- [Full site content as markdown](https://boatvaluecalculator.com/llms-full.txt)

## Data

- What actually moves a used boat's value, 2026. Methodology: This table describes the adjustments applied in used boat valuation and how each is evidenced. It publishes no percentages or depreciation curves, because values vary by hull type, engine, region and season and no public source sets a general rule; the calculator's inputs exist to be replaced with figures from your own comparables and survey. Documentation and survey references point at US Coast Guard recreational boating material and at two marine surveyors' associations as starting points for verification rather than as endorsements. Nothing here is a valuation or survey.
- Last updated: 2026-08-15. Every figure cites its source inline.
- Source: National Association of Marine Surveyors (NAMS): https://www.namsglobal.org/
- Source: Society of Accredited Marine Surveyors (SAMS): https://www.marinesurvey.org/
- Source: US Coast Guard, recreational boating safety: https://www.uscgboating.org/
- Source: National Marine Manufacturers Association: https://www.nmma.org/

## Citation

Cite as: "What actually moves a used boat's value, 2026", Boat Value Calculator, https://boatvaluecalculator.com/ (updated 2026-08-15).

## About

- Boat Value Calculator is an information site. It is not affiliated with, endorsed by or connected to any agency, association or company named here. Nothing on it is valuation, survey, insurance, legal or tax advice. We take no commission and carry no paid placements. This tool produces an indication from a base value you supply and adjustments you choose. It is not a valuation and not a survey, and no depreciation curve or standard adjustment is published here because used boat values vary by hull, engine, region and season. Only a qualified marine surveyor can assess a specific vessel, and title, lien and documentation questions are for the relevant registry and your own adviser.
- Operated by boatvaluecalculator.com. Contact: enquiries@boatvaluecalculator.com